gistfile1.cpp

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "GestureTapHighlighter.h"

#include "Element.h"
#include "Frame.h"
#include "FrameView.h"

#include "GraphicsContext.h"
#include "GraphicsTypes.h"
#include "Node.h"
#include "Page.h"
#include "RenderBoxModelObject.h"
#include "RenderInline.h"
#include "RenderObject.h"
#include "RenderLayer.h"

namespace WebCore {

namespace{

inline LayoutSize frameToMainFrameOffset(Frame* frame)
{
    LayoutPoint mainFramePoint = frame->page()->mainFrame()->view()->rootViewToContents(frame->view()->contentsToRootView(LayoutPoint()));
    return toLayoutSize(mainFramePoint);
}

} // anonymous namespace

namespace GestureTapHighlighter {

void drawHighlight(GraphicsContext* context, Node* node, const Color& color)
{
    RenderObject* renderer = node->renderer();
    Frame* containingFrame = node->document()->frame();

    if (!renderer || !containingFrame || !context)
        return;

    LayoutSize mainFrameOffset = frameToMainFrameOffset(containingFrame);

    // Don't translate the context if the frame is rendered in page coordinates.
    FrameView* view = containingFrame->page()->mainFrame()->view();
    if (!view->delegatesScrolling()) {
        FloatRect visibleRect = view->visibleContentRect();
        context->translate(-visibleRect.x(), -visibleRect.y());
    }

    if (renderer->isBox() || renderer->isRenderInline()) {
        LayoutRect contentBox;
        LayoutRect paddingBox;
        LayoutRect borderBox;

        if (renderer->isBox()) {
            RenderBox* renderBox = toRenderBox(renderer);
            contentBox = renderBox->contentBoxRect();
            paddingBox = LayoutRect(contentBox.x() - renderBox->paddingLeft(), contentBox.y() - renderBox->paddingTop(),
                    contentBox.width() + renderBox->paddingLeft() + renderBox->paddingRight(), contentBox.height() + renderBox->paddingTop() + renderBox->paddingBottom());
            borderBox = LayoutRect(paddingBox.x() - renderBox->borderLeft(), paddingBox.y() - renderBox->borderTop(),
                    paddingBox.width() + renderBox->borderLeft() + renderBox->borderRight(), paddingBox.height() + renderBox->borderTop() + renderBox->borderBottom());
        } else {
            RenderInline* renderInline = toRenderInline(renderer);
            // RenderInline's bounding box includes paddings and borders, excludes margins.
            borderBox = renderInline->linesBoundingBox();
        }

        RoundedRect rect(borderBox);
        rect.expandRadii(10);
        rect.inflateWithRadii(5);


        AffineTransform trans;


        LayoutPoint referencePoint;
    while (renderer) {
        RenderObject* next = renderer->container();
        if (!next)
            break;

        LayoutSize containerOffset = renderer->offsetFromContainer(next, referencePoint);
            TransformationMatrix t;
            renderer->getTransformFromContainer(next, containerOffset, t);

        trans *= t.toAffineTransform();
        referencePoint.move(containerOffset);
        renderer = next;
    }

        rect.move(mainFrameOffset);

        context->concatCTM(trans);
        context->fillRoundedRect(rect, color, ColorSpaceDeviceRGB);
    }
}

} // namespace GestureTapHighlighter

} // namespace WebCore